7. The nuclear model and the solar system model both show atoms with electrons circling around
the nucleus. How are these models similar?
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Answer:

color

Explanation:

Scientists can use the color of minerals to tell them apart.

Answer:

destroyed, from, endothermic

Explanation:

Energy is conserved in chemical reactions. It is neither created nor destroyed but can be transferred from one form to another.

An exothermic reaction transfers energy from the reacting substance to the surroundings. The body of the container feels warm. An exothermic reaction has a negative value of enthalpy.

An endothermic reaction transfers energy from the surroundings to the reacting substance. The body of the container feels cold. In an endothermic reaction, enthalpy is positive.

Answer:

Explanation:

Copper is a single element, not made up of anything but copper.

Salt is an element, as it is made up of multiple things, such as chlorine and sodium, but are combined per molecule. Jelly beans are made up of multiple elements, but are a mixture as they are not all the same. there isn't a single "jelly bean" molecule that is uniform throughout them.

Answer: Ramsar, Iran (happy to help)

Explanation:

Answer:

Mg + 2Ag⁺ ⟶ Mg²⁺ +2Ag  

Explanation:

1. Start with the skeleton equation.

Mg + Ag⁺ ⟶ Mg²⁺ + Ag  

2. Separate it into two half reactions

Mg ⟶ Mg²⁺  

Ag⁺ ⟶ Ag  

3. Balance charge by adding electrons to the deficient side

Mg ⟶ Mg²⁺ + 2e⁻

Ag⁺ + e⁻ ⟶ Ag  

4. Multiply each half-reaction by numbers to equalize the electrons transferred

1×[Mg ⟶ Mg²⁺ + 2e⁻]

2×[Ag⁺ + e⁻ ⟶ Ag]  

5. Add the two half-reactions, cancelling species that occur on each side

Mg ⟶ Mg²⁺ + 2e⁻

2Ag⁺ + 2e⁻ ⟶ 2Ag            

Mg + 2Ag⁺ ⟶ Mg²⁺ +2Ag

The equation is now balanced.

Answer:

A.Water moves in a continuous cycle from the surface of the Earth, through the crust, oceans, and atmosphere.

Thank You.

Answer:a

Explanation:

The difference between charging by conduction and charging by induction is

A. During induction, charges move between objects that briefly touch; during conduction, charges move between objects that are rubbed together.

Conduction charges another body with a charged body by came in contact with that body.

Induction charges another body without came in contact with that body.

Thus, the correct option is A

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Answer:

The correct answer is indeed A

Explanation:

Final answer:

Continental plates colliding under intense pressure and heat cause existing rocks to recrystallize into metamorphic rocks, contributing to the formation of mountain ranges such as the Himalayas.

Explanation:

When two continental plates converge, the intense pressure and heat they generate cause the existing rocks at the plate boundary to recrystallize, forming metamorphic rocks. This process, often associated with mountain building, is evident in the formation of the Himalayan Mountains at such a convergent plate boundary. Between colliding continental masses, like the African plate and the Eurasian plate forming the Alps, or the Asian and Arabian plates creating the Zagros Mountains, the pressure and heat metamorphose the rocks in the mountain chains. The creation and the shaping of these mountains are not solely due to tectonic forces but are also significantly affected by volcanic activity and erosion by elements like water and ice over time.

Answer:

Q = 75.312 KJ

Explanation:

Heat is the amount of the thermal energy contained in an object measured in joules.  When heat energy is transferred to an object, the temperature of the object changes depending on the amount of heat applied and the type of object.

Given that:

mass of water (m) = 225 g, Temperature difference ([tex]\Delta T[/tex]) = 100°C - 20°C = 80°C, Water’s specific heat capacity ([tex]c_p[/tex]) = 4.184 J/g°C

The quantity of heat (Q) is given as:

[tex]Q=mc_p\Delta T[/tex]

[tex]Q= 225g *4.184J/g^0C*80=75312J=75.312KJ[/tex]

The amount of heat in joules required to raise the temperature of 225 g of water from 20.0 °C to 100 °C is calculated using the heat equation q=mcΔT. After substituting appropriate values, we get the result as 75.3 kJ.

To calculate the amount of heat required to raise the temperature of 225 g of water from 20.0 °C to 100 °C, we can use the heat equation q = mcΔT where 'm' is the mass of the water, 'c' is the specific heat capacity of water, and 'ΔT' is the change in temperature.

Here, m = 225 g (the mass of the water), c = 4.184 J/g °C (the specific heat capacity of water), and ΔT = 100 °C - 20 °C = 80 °C (the change in temperature).

Hence, q = mcΔT = (225 g) × (4.184 J/g °C) × (80 °C) = 75312 J or 75.3 kJ after rounding to 3 significant figures. Hence, the amount of heat in joules required to raise the temperature of 225 g of water from 20.0 °C to 100 °C is 75.3 kJ.

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Answer:

Hydro power

Advantage- Clean source

Safe

Disadvantage- Expensive

Environmental consequences

Coal

Advantage- Easy to find

Affordable

Disadvantage- Non renewable

Pollution

Explanation:

I helped you out with two of them

Answer:

Angiosperms are further classified as monocotyledonous and dicotyledonous plants. Cotyledons are the first leaves – the seed leaves – that a plant grows upon germination. The female reproductive organs of an angiosperm are the stigma, style and the ovary which are collectively known as the carpel.

Explanation:

Answer:

105.9888 g/mol

Explanation:

The molar mass of sodium carbonate is 105.9888 g/mol (grams per mole)

Answer:

False.

Explanation:

Scientific theories and hypothesis are all tentative. Science tries to prove something is either true of false and come up with answers (as much as we can) for many problems. Sometimes they are made based on limited data or information. Over the years, we come up with need findings discoveries which are able to give us more information and give us better answers. There have been a couple of scientific laws which had to be completely revised or discarded after new observations. An example of this would be the Laws of Thermodynamics. A couple of the laws have been changed over the decades after scientists made new disoveries and observations.

Answer:

Cl2, N2O, F2, H2S

Explanation:

You must recall Graham's law at this point. Graham's law states that the rate of diffusion of a gas is inversely proportional to the square root of its vapour density or molar mass.

Now, the greater the molar mass of a gas, the lesser the rate of diffusion of that gas. The gas that will diffuse more slowly than oxygen must have a higher molar mass than oxygen. Oxygen has a molar mass of 32gmol-1, let us look at the molar masses of other gases.

F2= 37.99681 g/mol

Ne= 20.1797 gmol-1

N2O= 44.013 g/mol

C2H2= 26.04 g/mol

NO= 30.01 g/mol

Cl2= 70.906 gmol-1

H2S= 34.1 g/mol

Hence in order of decreasing slower diffusion than oxygen gas

Cl2, N2O, F2, H2S

Neon, Nitrous Oxide, and Hydrogen Sulfide diffuse more slowly than oxygen.

Oxygen (O2) is a diatomic gas that diffuses relatively quickly. Among the given gases, Neon (Ne), Nitrous Oxide (N2O), and Hydrogen Sulfide (H2S) diffuse more slowly than oxygen. Neon is a monatomic gas with a larger atomic mass, which affects its diffusion rate. Nitrous Oxide is a larger, more complex molecule, and Hydrogen Sulfide has a hydrogen bond, both of which slow down their diffusion rates compared to oxygen.

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Answer:

Eggshell is made almost entirely of calcium carbonate

Explanation:

Answer:380.580722 g/mol

Explanation:

380.580722 g/molCopper(II) phosphateNamesChemical formulaCu3(PO4)2Molar mass380.580722 g/mol (anhydrous) 434.63 g/mol (trihydrate)Appearancelight bluish-green powder (anhydrous) blue or olive crystals (trihydrate)Solubility in waterslightly soluble

The molar mass of Cu₃(PO₄)₂ is calculated by summing the contributions of copper, phosphorus, and oxygen, resulting in a total of 380.59 g/mole.

To calculate the molar mass of Cu₃(PO₄)₂, follow these steps:

Identify the atomic masses for each element:

Cu = 63.55 g/mole,

P = 30.97 g/mole,

O = 16.00 g/mole.

Calculate the contribution of each element in the compound:

Add the contributions to find the total molar mass:

Molar mass of Cu₃(PO₄)₂ = 190.65 g/mole + 61.94 g/mole + 128.00 g/mole

= 380.59 g/mole.

Therefore, the molar mass of Cu₃(PO₄)₂ is 380.59 g/mole.

Answer:

Rising action- A character struggles with a decision.

falling action- The consequences of the choice become clearer.

Climax- A character makes a decision.

Resolution- A character understands the moral.

Exposition- A major conflict is introduced.

Explanation:

no one else gave the right answer so I found out myself, but hey! always that one person right! Good luck!

Answer:

your welcome

Explanation:

Answer:

cotyledons

Explanation:

A vascular plant that produces flowers, reproduces with seeds, and has two cotyledons is known as a Eudicot. Examples include dandelions and violets. They make up two-thirds of all flowering plants.

A plant that is vascular, produces flowers, reproduces with seeds, and has two cotyledons belongs to the Eudicots, also known as true dicots. Examples of these plants include dandelions or violets. They possess vascular tissue that forms a ring in the stem and their flower parts come in four, five, or many whorls. Seed plants, like eudicots, are further divided into those that produce seeds in cones and those that produce seeds in the ovaries of flowers.

Additionally, eudicot plants have two cotyledons, and the veins form a network in their leaves. Their root system is generally characterized by one main root that develops from the embryonic radicle. Eudicots constitute about two-thirds of all flowering plants which also makes them a significant part of the angiosperms - a division of plants that emerged about 160 million years ago.

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Answer:

[tex]0.082 atm L mol^{-1} K^{-1}[/tex]

Explanation:

The pressure, the volume and the temperature of an ideal gas are related to each other by the equation of state:

[tex]pV=nRT[/tex]

where

p is the pressure of the gas

V is the volume of the gas

n is the number of moles

R is the gas constant

T is the absolute temperature

For the gas in this problem:

n = 2.00 mol is the number of moles

V = 17.4 L is the gas volume

p = 3.00 atm is the gas pressure

[tex]T=45C+273=318 K[/tex] is the absolute temperature

Solving for R, we find the gas constant:

[tex]R=\frac{pV}{nT}=\frac{(3.00)(17.4)}{(2.00)(318)}=0.082 atm L mol^{-1} K^{-1}[/tex]

Answer:

Liquid with a specific high heat

Explanation:

The type of substance would be best for use in a cooling system would be a liquid with a high specific heat and the correct option is option B.

The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius.

The units of specific heat are usually calories or joules per gram per Celsius degree. For example, the specific heat of water is 1 calorie (or 4.186 joules) per gram per Celsius degree.

This property of water in our body to maintain constant body temperature.

Therefore, The type of substance would be best for use in a cooling system would be a liquid with a high specific heat and the correct option is option B.

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Answer:

P = 24.34 atm

Explanation:

V = 5.0L

P = ?

n = 4.75 moles

T = 39.3°C = (39.3 + 273.15)K = 312.45K

From ideal gas equation,

PV = nRT

P = pressure of the gas

V = volume of the gas

n = no. Of moles present

R = ideal gas constant = 0.082atm.L / mol.K

PV = nRT

P = nRT / V

P = (4.75 * 0.082 * 312.45) / 5

P = 121.699 / 5

P = 24.339 atm

P = 24.34 atm

The pressure of the gas is 24.34 atm

Final answer:

The pressure in a 5.00 L tank with 4.75 moles of oxygen at 39.3 °C is calculated using the ideal gas law, resulting in approximately 24.65 atm.

Explanation:

To calculate the pressure of a gas in a tank, we can use the ideal gas law which is PV=nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.

First, convert the temperature from degrees Celsius to Kelvin by adding 273.15 to the Celsius temperature:

T = 39.3 °C + 273.15 = 312.45 K

Next, use the ideal gas law to calculate the pressure:

P =[tex]\frac{nRT}{V}[/tex]

Given n = 4.75 moles, T = 312.45 K, V = 5.00 L, and R = 0.0821 atm·L/mol·K (value of the ideal gas constant when pressure is measured in atmospheres), we can calculate the pressure:

P = [tex]\frac{(4.75 moles)(0.0821 atm·L/mol·K)(312.45 K)}{5.00 L}[/tex]

Doing the calculation:

P =[tex]\frac{(4.75)(0.0821)(312.45)}{5.00}[/tex] = 24.65 atm

This means the pressure inside the 5.00 L tank containing 4.75 moles of oxygen at 39.3 °C is approximately 24.65 atmospheres.

Final answer:

To find the mass of the AlF₃ sample that requires 3350 J to increase its temperature from 25°C to 80°C, we use the heat capacity formula. The specific heat capacity of aluminum (900 J/kg°C) is used and the mass is calculated to be 0.0677 kg or 67.7 grams.

Explanation:

To calculate the mass of the sample of AlF₃ that needed 3350 J of heat to raise its temperature from 25°C to 80°C, we use the heat capacity formula:

Q = mcΔT, where Q is the heat added, m is the mass, c is the specific heat capacity, and ΔT is the change in temperature.

The specific heat capacity of aluminum is 900 J/kg°C. Then we will solve for the mass (m) and rearrange the formula to m = Q/(cΔT).

Given that:

The calculation for the mass m is:

m = 3350 J / (900 J/kg°C × 55°C)

m = 3350 J / (49500 J/kg)

m = 0.0677 kg

Therefore, the mass of the AlF₃ sample is 0.0677 kg or 67.7 grams.

Answer:

B

Explanation:

The two little guys.

I just took this question in USATESTPREP and B was the correct choice.

Trust me

IMPORTANT --> I love you and you deserve the world <3

According to the law of conservation of matter, the reactants in order to complete the product side of the reaction is B . Thus option B is correct.

Law of conservation of matter stated that the total mass of the products must equal the total mass of the reactants in chemical processes.

It also stated that the amount of matter in any given system that is closed to the transfer of matter (in and out) remains constant.

There are basically four laws of conservation.

Reactants are defined as a material that enters and is changed during a chemical reaction.

Products are defined as a material found at the end of a chemical reaction.

Thus, according to the law of conservation of matter, the reactants in order to complete the product side of the reaction is B . Thus option B is correct.

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Answer:

1. False 2. True

Explanation:

1. Nitrogen forms the rungs

The mass of the platinum bar is approximately 699.9 grams.

To calculate the mass of the platinum bar, we can use its volume and density.

Given:

- Length (l) = 5.0 cm

- Width (w) = 4.0 cm

- Thickness (h) = 1.5 cm

- Mass (m) = 700.0 g

First, let's calculate the volume of the platinum bar using the formula for the volume of a rectangular prism:

[tex]\[ \text{Volume} = l \times w \times h \\\[ \text{Volume} = 5.0 \, \text{cm} \times 4.0 \, \text{cm} \times 1.5 \, \text{cm} \\\[ \text{Volume} = 30.0 \, \text{cm}^3 \][/tex]

Now, we can use the density formula to find the mass:

[tex]\[ \text{Density} = \frac{\text{Mass}}{\text{Volume}} \\\[ \text{Density} = \frac{700.0 \, \text{g}}{30.0 \, \text{cm}^3} \\\[ \text{Density} \approx 23.33 \, \text{g/cm}^3 \][/tex]

Now that we have the density of platinum, we can calculate the mass of the bar:

[tex]\[ \text{Mass} = \text{Density} \times \text{Volume} \\\[ \text{Mass} = 23.33 \, \text{g/cm}^3 \times 30.0 \, \text{cm}^3 \\\[ \text{Mass} \approx 699.9 \, \text{g} \][/tex]

So, the mass of the platinum bar is approximately 699.9 grams.

Answer:

Alkanes with more than 3 carbons can show constitutional isomerism. They can be either linear or branched structures. This is categorized as chain isomerism. Butane is the smallest alkane to show such isomerism with 2 isomers.Alkanes with more than 3 carbons can show constitutional isomerism. They can be either linear or branched structures. This is categorized as chain isomerism. Butane is the smallest alkane to show such isomerism with 2 isomers.

Explanation:

Final answer:

Alkanes exhibit structural isomerism, including branched-chain isomerism, where the same molecular formula has different structural arrangements. Alkenes can show structural as well as geometric isomerism due to the rigidity of the double bond.

Explanation:

Isomerism in Alkanes

The type of isomerism shown by alkanes is called structural isomerism, specifically branched-chain isomerism. This occurs when alkanes with the same molecular formula have different arrangements of carbon atoms. For example, butane (C4H10) can exist as a straight-chain alkane or it can have a branched-chain structure, resulting in isomers with different physical properties.

Branched-chain alkanes and straight-chain alkanes are isomers because they have the same molecular formula but different structural formulas, leading to different physical properties. In contrast, alkenes can exhibit structural isomerism as well as geometric isomerism, also known as cis-trans isomerism, which occurs due to restricted rotation around the double bond.

While alkanes only show structural isomerism such as straight-chain and branched-chain structures, alkenes can show both structural and geometric isomerism, where the spatial orientation of groups attached to the double bond leads to distinct isomers. This rigidity of the double bond in alkenes influences their chemical reactivity and physical properties.

Answer:

Identify

Explanation:

I just did a USATestprep on it your welcome

Answer:

identify

Explanation: